That gives me some pointers. I am still thinking about the idea of a fixed ram and an arm.

I may well have room for the buffer tank as the wheels are going to produce a rather humped back effect.

What hinges are you using for the flipper?

The bodywork is a fairly monocoque affair having got a perforated stainless steel box as scrap. the idea will be to weld this up and clad the outside with checkerplate ali and/or polycarbonate.